QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

3 km NNW of Chappaqua, New York

· 5.0 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Westchester County 5 kmRockland County 20 kmPutnam County 27 kmWestern Connecticut Planning Region 30 kmBergen County 35 kmBronx County 38 kmPassaic County 46 kmNew York County 48 kmGreater Bridgeport Planning Region 48 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 1.5 (ml)
Depth
5.0 km below the surface
Felt
26 reports · strongest reported intensity III
Nearest
Westchester County, 5 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 201 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 26 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 41.1851, -73.7866. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Westchester County, NY 5 km (3 mi) NW of here earthquakes near Westchester County
Rockland County, NY 20 km (13 mi) E of here earthquakes near Rockland County
Putnam County, NY 27 km (17 mi) S of here earthquakes near Putnam County
Western Connecticut Planning Region, CT 30 km (19 mi) WSW of here earthquakes near Western Connecticut Planning Region
Bergen County, NJ 35 km (22 mi) NE of here earthquakes near Bergen County
Bronx County, NY 38 km (23 mi) N of here earthquakes near Bronx County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

2 earthquakes have been recorded within 50 km since this one.

  1. 1.5 2 km SW of Purchase, New York
  2. 2.2 1 km E of Elmsford, New York

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.